使用电声门图和声学分析对发声健康成人喉双瓣功能的短期评估。

文献信息

中文摘要

目的： 喉双瓣功能（LDVF）原理假设，各种喉括约肌系统（例如，声带和室带）在需要呼吸控制的活动中有不同的参与方式。声带可能充当吸气瓣，而室带与杓会厌结构一起充当呼气瓣。本研究旨在调查用于嗓音治疗的LDVF导向练习，目的是检验LDVF原理，并评估在发声健康成人中通过电声门图（EGG）和声学测量可检测到的客观嗓音变化的程度。
方法： 在受试者内设计中，40名发声健康的参与者进行了两项LDVF导向的等长杆练习，旨在首先强调压力不足（UP）的胸廓向心性身体活动，其次强调压力过高（OP）的胸廓离心性身体活动。在声带和室带水平记录EGG，评估接触商和开放商。声学测量包括谐噪比、5点音高扰动商、平滑倒谱峰值突出、声门噪声激发比和相对基频。进行了总体检验和配对比较，并使用Cohen's d评估效应量。
结果： 未发现显著差异，例如，在UP导向和OP导向练习之间，声带或室带水平的两种EGG测量均无显著差异，并且未检测到干预前与干预后的效应（所有P > 0.05，效应量可忽略至小）。此外，没有任何声学参数显示显著的UP-OP差异或前后效应（所有P > 0.05；效应量小）。
结论： LDVF导向练习在发声健康成人中未产生EGG测量或声学嗓音质量参数的可测量变化。这些发现没有提供证据表明在当前实验条件下可检测到LDVF原理相关的效应。

英文摘要

OBJECTIVES: The laryngeal double valve function (LDVF) principle posits that various laryngeal sphincter systems (eg, vocal folds and ventricular folds) are differently engaged in activities requiring breath control. The vocal folds may act as an inspiratory valve, while the ventricular folds with the aryepiglottic structures function as an expiratory valve. The present study aimed to investigate LDVF-oriented exercises used in voice therapy, with the goal of examining the LDVF principle and assessing the extent to which objective vocal changes can be detected through electroglottographic (EGG) and acoustic measures in vocally healthy adults.
METHODS: In a within-subject design, 40 vocally healthy participants performed two LDVF-oriented isometric bar exercises intended to emphasize first an under-pressure (UP) thoraco-petal body activity and second an over-pressure (OP) thoraco-fugal body activity. EGG was recorded at vocal fold and at ventricular fold levels assessing contact quotient and open quotient. Acoustic measures included harmonics-to-noise-ratio, 5-point pitch-perturbation quotient, smoothed cepstral peak prominence, glottal-to-noise excitation ratio and relative fundamental frequency. Overall tests and paired comparisons were performed, and effect sizes were evaluated with Cohen's d.
RESULTS: No significant differences were found, for example, between UP- and OP-oriented exercises for both EGG measures at vocal fold or at ventricular fold levels, and no preintervention versus postintervention effects were detected (all P > 0.05, negligible to small effect sizes). Furthermore, none of the acoustic parameters showed significant UP-OP differences or pre-post effects (all P > 0.05; small effect sizes).
CONCLUSION: LDVF-oriented exercises did not produce measurable changes in EGG measures or acoustic voice quality parameters in vocally healthy adults. These findings provide no evidence for detectable LDVF principle-related effects under the present experimental conditions.